IEC 61757:2026

Overview

IEC 61757:2026 – Fibre optic sensors – Generic specification is an international standard developed by the International Electrotechnical Commission (IEC). This second edition defines, classifies, and provides a framework of generic test and measurement methods for the characterization and specification of fibre optic sensors and their specific components and subassemblies. The requirements within IEC 61757:2026 apply to all related fibre optic sensor standards in the broader IEC 61757 series, which addresses both general and measurement-specific requirements for various types of fibre optic sensors, including those designed for individual sensing applications.

This edition cancels and replaces the first edition published in 2018, and introduces significant technical updates related to metrological parameters, terminology, normative references, and technical content in its annexes. With a growing demand for precision sensing in diverse sectors, IEC 61757:2026 provides a comprehensive reference to support the development, verification, and deployment of fibre optic sensor technologies across industries.

Key Topics

• Classification and Definitions: Clear definitions and classifications for fibre optic sensors, including terms for intrinsic/extrinsic, distributed, point, and multi-point sensor configurations, aligned with harmonized terminology across global standards.
• Test and Measurement Framework: A suite of standard test methods and measurement procedures ensures reliability and repeatability in sensor characterization, addressing optical, electrical, mechanical, environmental, and metrological properties.
• Component and Subassembly Requirements: Criteria for quality assurance, marking, packaging, and instruction manuals, ensuring a foundation of quality and traceability for sensor suppliers and system integrators.
• Metrological Parameters Expansion: An enhanced list of measurement parameters to align with technological advances and industry needs.
• Updated Normative References: Alignment with the latest IEC and ISO publications, ensuring up-to-date compliance and interoperability.
• Safety Aspects: Standards for the safe use of fibre optic sensors, including operation in hazardous or explosive environments.

Applications

Fibre optic sensors, as defined by IEC 61757:2026, provide advanced solutions for a wide range of technological and industrial fields where precision measurement and reliability are critical. Typical application domains include:

• Industrial Automation and Process Control: Monitoring of physical quantities such as temperature, pressure, strain, or displacement in environments demanding immunity to electromagnetic interference.
• Energy and Utilities: Distributed and multi-point fibre optic sensors for power grid monitoring, oil and gas pipeline integrity, and structural health monitoring in wind turbines or dams.
• Transport and Infrastructure: Real-time surveillance of bridges, tunnels, railways, and smart roadways using distributed sensing for structural safety and predictive maintenance.
• Medical and Healthcare: Miniaturized and biocompatible sensors for minimally invasive diagnostics, patient monitoring, and medical device instrumentation.
• Aerospace and Defense: High-precision sensors supporting composite material monitoring, high-energy radiation detection, and vibration analysis in aircraft and spacecraft.
• Environment and Safety: Detection of toxic chemicals or particles, environmental monitoring of water levels, and hazardous environment safety in explosive atmospheres.

Related Standards

IEC 61757:2026 references and aligns with numerous complementary standards to maximize interoperability and technical rigor, including:

• IEC 60068-1: Environmental testing – General and guidance
• IEC 60079-28: Explosive atmospheres – Protection of equipment and transmission systems using optical radiation
• IEC 60825-1 / IEC 60825-2: Laser safety and fibre optic communication system safety
• IEC 61300-3-35: Fibre optic interconnect devices and passive components – Visual inspection of optical fibre connectors
• IEC 61753 series: Performance standards for fibre optic interconnect devices and passive components
• IEC TR 61931: Fibre optics – Terminology
• ISO/IEC Guide 99: International vocabulary of metrology (VIM)

Manufacturers, integrators, and end-users seeking up-to-date, harmonized guidance for the design, validation, and deployment of fibre optic sensors will find IEC 61757:2026 an essential reference for compliance and best practice in the rapidly evolving field of photonic sensing technologies.